>>> time.localtime() # 不传入参数
time.struct_time(tm_year=2018, tm_mon=12, tm_mday=19, tm_hour=18, tm_min=47, tm_sec=30, tm_wday=2, tm_yday=353, tm_isdst=0)
>>> time.localtime(time.time()) # 传入当前时间
time.struct_time(tm_year=2018, tm_mon=12, tm_mday=19, tm_hour=18, tm_min=47, tm_sec=39, tm_wday=2, tm_yday=353, tm_isdst=0)
>>> time.localtime(1544200000.1232) # 传入其他时间戳
time.struct_time(tm_year=2018, tm_mon=12, tm_mday=8, tm_hour=0, tm_min=26, tm_sec=40, tm_wday=5, tm_yday=342, tm_isdst=0)
3）time.gctime()
>>> time.gmtime()
time.struct_time(tm_year=2018, tm_mon=12, tm_mday=19, tm_hour=10, tm_min=53, tm_sec=10, tm_wday=2, tm_yday=353, tm_isdst=0)
4）time.mktime()
>>> time.mktime(time.localtime())
1545216822.0
5）strftime(format, p_tuple=None)